Operator characteristics personality factors

The likelihood for the development of symptoms following inhalation exposure and the nature and severity of respiratoiy tiact injuiy depends on a number of factors, which include the chemical namre of the smoke, concentration and toxic potency of inhaled materials, particle size and vapor proportion, duration of exposure, water solubility, respiratory minute volume, and personal characteristics (e.g., differential susceptibility, exertion). During training and operational use, exercise will result in an increased respiratory minute volume (effect of tachypnea and increased tidal volume) and thus a greater inhalation exposure dose. Most of the more soluble inhaled material will tend to predominantly affect the upper airways, and the less soluble materials affect mainly the peripheral airways and alveoli. 

The variability of human performance is reflected by individual differences of skill, experience, motivation, and other personal characteristics of work force. There can be a wide range of specific environmental situations and other physical aspects of the tasks to be performed. Only some of this variation regarding the performance-shaping factors is accounted for in HEP s by provision of different estimates of HEP s for different sets of influencing factors such as experience of the operator, level of stress, and ergonomic layout. 

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